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108 lines
4.1 KiB
HTML
108 lines
4.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<TITLE>Apache MPM dexter</TITLE>
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</HEAD>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">Multi-Processing Module dexter</H1>
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<P>
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This Multi-Processing Module implements a hybrid multi-process
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multi-threaded web server with a variable number of threads per
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process.
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</P>
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<P><A
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HREF="module-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> MPM
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<BR>
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<A
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HREF="module-dict.html#SourceFile"
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REL="Help"
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><STRONG>Source File:</STRONG></A> dexter.c
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<BR>
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<A
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HREF="module-dict.html#ModuleIdentifier"
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REL="Help"
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><STRONG>Module Identifier:</STRONG></A> mpm_dexter_module
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</P>
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<H2>Summary</H2>
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<p>This Multi-Processing Module (MPM) implements a hybrid
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multi-process, multi-threaded web server. A fixed number of processes
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create threads to handle requests. Fluctuations in load are handled
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by increasing or decreasing the number of threads in each process.</p>
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<p>A single control process launches the number of child processes
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indicated by the <code>NumServers</code> directive at server startup.
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Each child process creates threads as specified in the
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<code>StartThreads</code> directive. The individual threads then
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listen for connections and serve them when they arrive.</p>
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<p>Apache always tries to maintain a pool of <em>spare</em> or idle
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server threads, which stand ready to serve incoming requests. In this
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way, clients do not need to wait for new threads to be created. For
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each child process, Apache assesses the number of idle threads and
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creates or destroys threads to keep this number within the boundaries
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specified by <code>MinSpareThreads</code> and
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<code>MaxSpareThreads</code>. Since this process is very
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self-regulating, it is rarely necessary to modify these directives
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from their default values. The maximum number of clients that may be
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served simultaneously is determined by multiplying the number
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of server processes that will be created (<code>NumServers</code>) by
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the maximum number of threads created in each process
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(<code>MaxThreadsPerChild</code>).</p>
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<p>While the parent process is usually started as root under Unix in
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order to bind to port 80, the child processes and threads are launched
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by Apache as a less-privileged user. The <code>User</code> and
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<code>Group</code> directives are used to set the privileges of the
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Apache child processes. The child processes must be able to read all
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the content that will be served, but should have as few privileges
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beyond that as possible. In addition, unless <a
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href="../suexec.html">suexec</a> is used, these directives also set
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the privileges which will be inherited by CGI scripts.</p>
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<p><code>MaxRequestsPerChild</code> controls how frequently the server
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recycles processes by killing old ones and launching new ones.</p>
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<p>See also: <a href="../bind.html">Setting which addresses and ports
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Apache uses</a>.</p>
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<H2>Directives</H2>
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<UL>
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<li><a href="mpm_common.html#connectionstatus">ConnectionStatus</a></li>
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<li><a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li>
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<li><a href="mpm_common.html#group">Group</a></li>
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<li><a href="mpm_common.html#pidfile">PidFile</a></li>
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<li><a href="mpm_common.html#listen">Listen</a></li>
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<li><a href="mpm_common.html#listenbacklog">ListenBacklog</a></li>
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<li><a href="mpm_common.html#lockfile">LockFile</a></li>
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<li><a href="mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></li>
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<li><a href="mpm_common.html#maxsparethreads">MaxSpareThreads</a></li>
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<li><a href="mpm_common.html#maxthreadsperchild">MaxThreadsPerChild</a></li>
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<li><a href="mpm_common.html#minsparethreads">MinSpareThreads</a></li>
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<li><a href="mpm_common.html#numservers">NumServers</a></li>
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<li><a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li>
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<li><a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li>
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<li><a href="mpm_common.html#startthreads">StartThreads</a></li>
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<li><a href="mpm_common.html#user">User</a></li>
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</UL>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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